S85 CSL Carbon Plenum
by InfinityDesign

In 2009, BMW M built a one-off prototype of a BMW M5 CSL based on the E60 M5 V10. Meant as celebration for the 25 years of the BMW M5, it was never released. 

There were various must-haves in the eyes of S85 owner, yet none were as arguably desired as the entirely massive carbon air intake system. 

The engineers at BMW M developed a prototype in short order, and didn't consider the real world implications of their design.

They knew it would never be produced [...] no one dared.

Enjoy : )

Matt / @m3_epoustouflant
From a myth, to a prototype, to reality.
I take a dive into the backstory to the M5 V10 CSL, its mythical carbon intake system and the research & development of the InfinityDesign S85 CSL Carbon Plenum.
Technical Journal Entry 2 of 2
Keyword: Modular

The engineering team at Infinity Design is tackling this development project with a key focus on modularity. 

In this journal entry, Sal & I discuss why modularity matters and how it translated to key technical specifications.

The Specs

Pre-preg & autoclave'd carbon construction

The thinner pre-preg carbon constructions allows for more induction noises to come through.

OEM+ or Competition Spec

The OEM+ is targeted for those looking to improve aesthetics and noise while keeping MAP tuning.

The Competition Spec is a complete air intake, plenum and Alpha N tuning kit with massively increased air volume that aims at performance increases.

CNC'ed fittings

The carbon trumps have CNC'ed ITB fittings for durability.

Fits with OEM hoses

The design retains all PCV, oil and vacuum hoses fittings.

Available in Gloss or Matte

The finish is achieved using a 2 component automotive clear coat.

Spec your kit
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
S85 CSL Carbon Plenum
Infinity Design


S85 CSL Carbon Plenum

  • Factory Direct Process
  • EuroConnex Exclusive
Regular price$2,799.00


  • Modular Plenum Design: 
    • Modular velocity stacks design for customization per performance objectives. 
    • Modular intake inlet design for increase air volume. 
    • Modular construction for easy fitting to the angled S85 throttle bodies. 
    • Removable bolted lid for easy access to velocity stacks & removal of the plenum.
  • CNC'ed ITB fittings for reliability. 
  • Retains all PCV and vacuum hoses.
  • Complete pre-preg & autoclaved carbon fiber construction 
    • 2x2 weave pattern
    • Matte or Gloss clear coated finish.


OEM CSL style kit includes: 

  • Plenum design with OEM diameter inlets.
  • Fitted with OEM style velocity stacks. 
  • Fits with OEM style air intakes
  • Compatible with MAF.

Competition CSL complete kit includes: 

  • Plenum design with larger CSL style inlets
  • Extra bung for air intake sensor
  • Sealed carbon intakes with larger CSL style inlet tubes
  • Alpha N Tuning
  • Can be fitted with OEM style velocity stacks or Competition lengthened runners for mid range torque bump. 

    Installation Notes

    Sal @ InfinityDesign
    Legacy knowledge.

    InfinityDesign's unique product design and engineering is crafted by the grand-daddy of the most popular S85 products and tuners to hundreds of S85s.


    As a former Evolve co-owner, he took part in engineering the headers & e-tronic exhaust system, cat deletes, carbon intakes, v8 supercharger kits and tuning maps during the 2000s and early 2010s.

    Need help?